This July 11, 2017 photo shows gnarled, dead bristlecone pine trees in the White Mountains in east of Bishop, Calif. Limber pine is beginning to colonize areas of the Great Basin once dominated by bristlecones. Bristlecone pines, the oldest trees on Earth, are losing a race to the top of mountain ranges throughout the Western United States, where they can for live 5,000 years, say researchers who find that climate change is putting future generations in peril. (AP Photo/Scott Smith))